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我们在教学长方形周长时,引导学生沿着“从感性到理性、再从理性到实践”过条途径,通过观察、思考和动手操作,来掌握和应用周长公式。促使他们在积极思维活动中发展智能,掌握知识。具体作法如下:课前,教师把一块长方形木板平均分成六个小方格,横线用红色画,竖线用蓝色画。并且在木板的四周粘上胶布,两条长边上的胶布涂上红色,两条短边
When teaching the perimeter of the rectangle, we guided the students to grasp and apply the perimeter formula by observing, thinking and practicing along the path of “from perceptual to rational, then from rational to practical”. Facilitate the development of intelligence and mastery of knowledge in positive thinking activities. Specific practices are as follows: Before class, the teacher evenly divided a rectangular plank into six small squares, horizontal lines painted with red, vertical lines painted with blue. And in the wood around the adhesive tape, two long sides of the tape coated with red, two short sides